By 1979, the two structures are merged into a single entity. With the completion of the latest expansion (in light gray), EL CON MALL houses five anchors, approximately 1,023,800 leasable square feet and contains 124 stores and services. These are accessed from two fully-enclosed shopping concourses.

EL CON prospered, as the only major shopping center in town, for over 13 years. PARK MALL, the region's second enclosed retail venue, was inaugurated in May 1975. Developed by one of the owners of EL CON, PARK MALL was not a true competitor...at  least in its early years.
Graphic from the Sierra Investment Company

THE TUCSON MALL, which was completed in March 1982, was an EL CON competitor from the start.
Graphic from Forest City Rental Properties, Incorporated

Finally, there was FOOTHILLS MALL. Its grand opening was held in August 1982, providing even more retail rivalry for EL CON MALL.
Graphic from Federated Stores Realty, Incorporated